<template>
    <div class="type-nav">
        <div class="container">
            <div @mouseleave="leaveIndex" @mouseenter="enterShow">
                <h2 class="all">全部商品分类</h2>
                <transition name="sort">
                    <div class="sort" v-show="show">
                        <div class="all-sort-list2">
                            <div class="item" v-for="(c1,index) in categoryList" :key="c1.categoryId"
                                :class="{cur:currentIndex == index}">
                                <h3 @mouseenter="changeIndex(index)">
                                    <a @click="goSearch1(c1.categoryName,c1.categoryId)">{{c1.categoryName}}</a>
                                </h3>
                                <div class="item-list clearfix" :style="{display:currentIndex==index?'block':'none'}">
                                    <div class="subitem" v-for="(c2,index) in c1.categoryChild" :key="c2.categoryId">
                                        <dl class="fore">
                                            <dt>
                                                <a
                                                    @click="goSearch2(c2.categoryName,c2.categoryId)">{{c2.categoryName}}</a>
                                            </dt>
                                            <dd>
                                                <em v-for="(c3,index) in c2.categoryChild" :key="c3.categoryId">
                                                    <a
                                                        @click="goSearch3(c3.categoryName,c3.categoryId)">{{c3.categoryName}}</a>
                                                </em>
                                            </dd>
                                        </dl>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </transition>
            </div>
            <nav class="nav">
                <a href="###">服装城</a>
                <a href="###">美妆馆</a>
                <a href="###">尚品汇超市</a>
                <a href="###">全球购</a>
                <a href="###">闪购</a>
                <a href="###">团购</a>
                <a href="###">有趣</a>
                <a href="###">秒杀</a>
            </nav>
        </div>
    </div>
</template>

<script>
import { mapState } from 'vuex'
// 是把所以的lodsh内容引进, 可以按需引入
// import _ from 'lodash'
// console.log(_);
export default {
    name: 'TypeNav',
    data() {
        return {
            currentIndex: -1,
            show: true
        }
    },
    mounted() {
        // this.$store.dispatch('categorList')
        if (this.$route.path != '/home') {
            this.show = false
        }
    },
    computed: {
        ...mapState({
            categoryList: (state) => state.home.categoryList
        })
    },
    methods: {
        changeIndex(index) {
            // 正常情况：用户正常操作都会触发事件
            this.currentIndex = index
            // 非正常情况,当用户操作过快时,事件没有触发,浏览器反应不过来 
        },
        goSearch1(categoryName, id) {
            this.$router.push({
                name: 'search',
                query: { categoryName, category1Id: id }
            })
        },
        goSearch2(categoryName, id) {
            this.$router.push({ name: 'search', query: { categoryName, id } })

        },
        goSearch3(categoryName, id) {
            this.$router.push({ name: 'search', query: { categoryName, id } })
        },
        // 鼠标进入时显示三级联动
        enterShow() {
            if (this.$route.path != '/home') {
                this.show = true
            }
        },
        leaveIndex() {
            this.currentIndex = -1
            if (this.$route.path != '/home') {
                this.show = false
            }
        },
    }
}
</script>

<style lang="less" scoped>
.type-nav {
    border-bottom: 2px solid #e1251b;

    .container {
        width: 1200px;
        margin: 0 auto;
        display: flex;
        position: relative;

        .all {
            width: 210px;
            height: 45px;
            background-color: #e1251b;
            line-height: 45px;
            text-align: center;
            color: #fff;
            font-size: 14px;
            font-weight: bold;
        }

        .nav {
            a {
                height: 45px;
                margin: 0 22px;
                line-height: 45px;
                font-size: 16px;
                color: #333;
            }
        }

        .sort {
            position: absolute;
            left: 0;
            top: 45px;
            width: 210px;
            height: 461px;
            position: absolute;
            background: #fafafa;
            z-index: 999;

            .all-sort-list2 {
                .item {
                    h3 {
                        line-height: 30px;
                        font-size: 14px;
                        font-weight: 400;
                        overflow: hidden;
                        padding: 0 20px;
                        margin: 0;

                        a {
                            color: #333;
                        }
                    }


                    .item-list {
                        // display: none;
                        position: absolute;
                        width: 734px;
                        min-height: 460px;
                        background: #f7f7f7;
                        left: 210px;
                        border: 1px solid #ddd;
                        top: 0;
                        z-index: 9999 !important;

                        .subitem {
                            float: left;
                            width: 650px;
                            padding: 0 4px 0 8px;

                            dl {
                                border-top: 1px solid #eee;
                                padding: 6px 0;
                                overflow: hidden;
                                zoom: 1;

                                &.fore {
                                    border-top: 0;
                                }

                                dt {
                                    float: left;
                                    width: 54px;
                                    line-height: 22px;
                                    text-align: right;
                                    padding: 3px 6px 0 0;
                                    font-weight: 700;
                                }

                                dd {
                                    float: left;
                                    width: 415px;
                                    padding: 3px 0 0;
                                    overflow: hidden;

                                    em {
                                        float: left;
                                        height: 14px;
                                        line-height: 14px;
                                        padding: 0 8px;
                                        margin-top: 5px;
                                        border-left: 1px solid #ccc;
                                    }
                                }
                            }
                        }
                    }

                    // &:hover {
                    //     .item-list {
                    //         display: block;
                    //     }
                    // }

                }

                .cur {
                    background-color: skyblue;
                }
            }
        }
        .sort-enter {
            height: 0;
        }
        .sort-enter-to {
            height: 800px;
        }
        .sort-enter-active {
            transition: all .4s linear;
        }
    }
}
</style>